Moral development is important because a person cannot be controlled all of the time. We have to rely on people to do the right thing. Doing the right thing does not come naturally to people. They have to learn about the social contract from a young age.

Moral development is extremely important in the life of every human being. As the link below says,

Moral development is a concern for every parent. Teaching a child to distinguish right from wrong and to behave accordingly is a goal of parenting.

If anything, this understates the matter. Teaching a child to distinguish right from wrong is the main concern for every parent.

If parents are religious, they will clearly want their children to learn to distinguish right from wrong. The ability to make this distinction will have an impact on the health of their child's soul -- nothing could be more important than this.

Even parents who are not religious will care about moral development. They will know that a person with bad morals is likely to have a hard life. He or she might get in legal trouble, for instance. Even if it doesn't go that far, a person without good morals will generally have a hard time developing strong relationships with other people and will struggle to find a good job.

People need to know the difference between right and wrong. Therefore, moral development is extremely important.